tam giac ABC nhon ngoai tam giac ve cac tam giac deu ABD,ACE dung hinh binh hanh ADFE chung minh tam giac FBC deu 
bai 2 ABC la tam giac nhon co canh BC co dinh nam tren duong thang xy ve hai tam giac vuong can ABD,ACE cung nam tren mot nua mat phang chua diem A co bo xy ke DM vuong goc voi xy o M và EN vuông góc voi xy ở N 
a) chung minh khi dem A di dong thi tong DM+EN khong doi 
chung minh duòng tHẳng DE luon di qua mot diem co dinh

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